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Member postings for DrDave

Here is a list of all the postings DrDave has made in our forums. Click on a thread name to jump to the thread.

Thread: Tracy Tools
11/08/2019 09:52:16

+1 for Tracy Tools. I ordered an M3 tap online recently. 10 minutes later, I realised that it was actually an M4 tap that I wanted. On the ‘phone to explain my predicament: not a problem. They changed the order details and the correct tap arrived in the post the next day. I have always had good service from them.

Thread: A little rant about Emojis and their kin
17/07/2019 11:19:34

When reading Facebook on my iPad, I get lots of adverts from Red Bull. Being youth-oriented, they tend to include many emojis in their text. I find them really annoying because of the way we actually read: not word-by-word, but scanning several words at a time. Coming across an emoji embedded in a sentence forces me to stop, translate the emoji into English and put it into context in the sentence. A huge waste of my time! Perhaps they are just like learning a new language: once the brain understands them, do they just scan with the surrounding words?

And don't get me started on texting abbreviations such as "ur". I read the sentence "Where is ur bag?", for example, as "Where is you are bag?". End of rant...

Thread: What Did You Do Today 2019
12/07/2019 12:18:05

Making arbors for slitting saws seems to be topic of the month, looking at other forum posts. I need one for making some clevices for my tender, so this is what I have made. The hole through the end of the shank serves no purpose: it was pre-existing on the bar in my scrap box. I also made a 1 mm thick washer to avoid the corner radius on the cap, allowing the cutter to seat correctly.

It runs true in my ER chuck, but this is not important. The manufacturer of my slitting saw did not bother to put the hole in the centre and it runs like a single-point cutter...


Thread: Model Turbines
10/04/2019 21:29:34

I was wondering how you were going to machine the reversing chamber around the whole internal circumference: I had forgotten that you only need a short length. A very elegant design! I hope that it runs well.

Thread: Steam Boiler
08/04/2019 20:10:46

With a maximum Fe content of 3%, Inconel 740 is hardly a steel! It is designed for the superheater section of a coal-fired boiler in a power station, but does its cost not make it less attractive, even given the probable difficulties in trying to get a boiler certificate.

Thread: What Did You Do Today 2019
14/03/2019 22:18:45

Thanks for providing those links, Michael. I looked through the pdfs, but no sign of my “new” drill. I’ll put a photo in my album tomorrow to see if that stirs any further memories from anyone.


14/03/2019 21:34:10

Went to Oxford to collect a rotary table that I bought. When I got home, I found a high speed drill press that had snuck into the boot while I was not watching. Seriously, though, I have been after one to replace my el Cheapo drill for some time & the gent that I visited offered it to me at a price that I could not refuse.

The drill is by Multico, but there is no other info that I can see. I cannot find any info on about this machine: does anyone have any info about it? The three speeds would be a start!

Thread: Aircraft General Discussion
08/03/2019 12:03:24
Posted by Cornish Jack on 08/03/2019 11:28:46:

Just come across this -

Don't understand the technical significance but VERY impressive images!



That’s impressive photography! I’ve only seen this type of photograph from a supersonic wind tunnel before: to achieve these results in the Great Blue Yonder opens up all sorts of possibilities.


19/02/2019 18:38:11
Posted by martin perman on 19/02/2019 16:41:55:

According to the time table they should have been in the Bedford area around 13:20 but didnt see hide nor hair of them.

Martin P

Martin, they are due over RAE Bedford tomorrow. We went to RAF Cosford to see them today. Two hours there, two hours back, for an 8 second flypast... At least their museum has some exceptional aeroplanes and missiles to view.

Thread: Emco F1 Mill Upgrade
25/01/2019 16:20:11


Further to John’s reply, I used the SI-5 “Barrier Terminal Board Signal Isolator” with my KBIC240 controller. It provides the required isolation between the power & control circuits (or at least no smoke has escaped so far).



22/01/2019 13:13:36

Emgee, thanks for that info. I checked the DIP switches on my stepper drivers: I set them to limit the current to 1.5 amps (the driver is capable of 4.5 A). I recall that I set them to the low value to protect things whilst I got used to the machine. Perhaps I will leave them there! I am not chasing maximum feeds on this machine.



22/01/2019 09:31:21

Hi Bitzer,

Yes, I used the KBIC-240 (stock code BB-9428), the reciept does not say whether it is the D model... I have used the 0.05 ohm resistor, but don’t take my word that this is the correct one! I has worked so far, but the mill has not seen much use over winter since I finished the mod.

Steppers & drivers are a bit out of my comfort zone. I chose steppers that looked to be similar to Emco’s originals in terms of torque, though I never did find the specs for Emco’s steppers. I was concerned that an increase in stepper torque, without beefing up the screws & nuts, would invite serious damage at the first crash.



22/01/2019 08:39:03

Rod, I paid £102.60 for the SI-5 board from Axis Controls in May last year.



21/01/2019 20:06:26

Hi Rod,

The mill has the original DC motor. The wiring schematic from Centroid shows the KBIC motor controller with their SI-5 barrier terminal board. I bought one of these (sound of air being sucked through teeth), wired it in accordance with the schematic & it worked first time.

I have a 3 phase motor with VFD in my lathe. That also uses an Acorn card and, when I set the correct parameters on the VFD, the 0-10V output on the Acorn controls the spindle speed.

Bitzer: my apologies for not answering. I did not see your post come in... Digging through the paperwork showed the steppers to be 57HS82-3008B.

I trust this helps. If not, please ask and I will do my best to answer.


Thread: Colin Chapman - Great Lives, 4:30 today
16/01/2019 17:18:30

One of my friends worked for Chapman’s F1 team & tells many tales of his time there. Such as the time the Chief Aerodynamicist had a blazing row with Chapman in Chapman’s office. The row culminated in the Chief Aero Chap walking out and slamming the door behind him. Only to sheepishly reappear moments later when he realised that he had gone into the broom cupboard!

Thread: What Did You Do Today 2019
12/01/2019 13:57:59
Posted by Emgee on 12/01/2019 13:50:46:
Posted by DrDave on 12/01/2019 13:00:20:

I have just received a parcel from Arc. I have been dithering over their one-shot oiling system for some time and, now the bits have been added to the clearance list, I finally succumbed to the temptation.

Is that for the F1 Dave ?


No, for my Myford. The F1 only has three oiling points (and an oil gun that is infinitely superior to the Myford one).

I think that the oilers might be a push fit (correct me if I am wrong) and the thought of stripping the mill, tapping the holes, cleaning & reassembling it makes me go weak at the knees!


12/01/2019 13:00:20

I have just received a parcel from Arc. I have been dithering over their one-shot oiling system for some time and, now the bits have been added to the clearance list, I finally succumbed to the temptation.

Thread: Ukraine model engine factories
06/01/2019 18:35:23
Posted by Barrie Lever on 06/01/2019 18:26:07:

I have a few take off issues, the dolly is ultra critical

I used to use Ian’s dolly, so pure pilot induced cock-ups. But with the thrust line outboard from the cg, there is an inward turning moment that bit me most times sad.

Thread: what solvent cleaner to use?
06/01/2019 18:22:34

In addition to some of the above solvents, I also use good old Gunk for stubborn dirt. It shifts oily dirt, but not the paint, and rinses off with water.

Thread: Ukraine model engine factories
06/01/2019 18:18:55

Yes, I flew the OPS in Ian’s “speed trainer”. Very docile (& slow!), but I had an interesting moment when the down line broke when I tried to shut off the engine...

I never really got to grips with the fully asymmetrical ‘planes: it would inevitably turn in and eat the lines. I only got a few flights with the OPS in a proper model.

Respect, too, to anyone who flys a CL pulsejet!



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